Coolant filter



FIG. 1 is a top perspective view of a coolant filter showing my new design;

FIG. 2 is a front elevational view thereof, the rear being identical in appearance;

FIG. 3 is a side elevational view thereof, the opposite side being identical in appearance;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view of a second embodiment thereof, the only difference residing in its height; and

FIG. 7 is a top plan view of a third embodiment thereof, the only difference residing in its width. 

The ornamental design for a coolant filter, as shown and described. 